Arrangement for exercising remote control over repeaters



March 16,1926. I 1,576,561

J. F. TOOMEY ARRAN G-BIZEINT FOR EXERGISING REMOTE CONTROL OVER REPEATERS Filed June 2, 1925 0 650m l I 1 101 6 1 666 Operate INVENTOR ATTORNEY Famed Mar, 16, 19261 outrun-stares I earner JOHN F. TOOMEY, OF NEW YORK, N. Y., ASSIGNOR TO AMERICAN. TELEPHONE AIilID i TELEGRAPH COMPANY, A CORIPORTION OF NEW YORK.

' ARRANGEMENT FOR EXERCISING REMOTE CONTROL OVER REPEATEBS.

] Application filed June 2,

To all whom it may concern Be it known that I, JOHN F. 'looiunr, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain Improvements in Arrangements for Exercising Remote Control Over Repeaters, of which the following, is a specification.

'This invention relates to signaling sys-l toms and more particular] y to arrangemeifrit for exercising control over repeater apparratus included in such systems, said control being exercisedover the repeater apparatus from a station remote therefrom.

In the arral'igenwnts of the invention, alternating signaling current is transmitted from a distant station to a station including repeater apparatus. This application of al-. ternatinp; current serves to energize the re-i peater elements and also to signal an operator at a farther distant station. A further novel feature of the invention consists in the fact that a second applicatidn of alternating signaling current to the line serves to de-energize the repeater apparatus, but does not again signal the operator at the farther distant station. Other purposes and features of the invention will appear more fully from the following detailed description thereof.

The invention may he more fully understood from the following description togclhcr with the accompanying drawing, in the figure of which is shown a circuit diagram illustrating a preferred arrangcn'ient of the invention.

In the drawing is shown a station includmg a. two-way, two-element repeater interconnecting the lines L, and L Tlhc line .L terminates in a lialauciin network N and l P; l

the usual three-whirling transformer l. Bridged across the line L, is an input circuit 3, including a potention'ietcr device 4 associated with the circuit 5 of a' vacuum tube re peatcr device (3. In the output circuit 8 of the vacuum tube (5 there might be included a wave filter device 7 of'a type well know in the art, The output circuit 8 is coupled tothe line L through the three-winding transformer 2. Bridged across the midpoints of the windingsof transformer 2 is the input circuit't), which includes a potentiometer device 10 and is associated with a circuit 11 includin a vacuum tube device 12 The output circuit 14: of the vacuum tube 12 m y include a e e fil er o "a yel mo up nithis manner heezuise reta l;

1925. Serial N'o, 34,466,

:type and will be coupled to the line through the three-winding transformer 1" As the operation of the two-way, two-element repeater is well known, no further de scription thereof will be given. eo-

The apparatus for exercisingcontrol over the repeater from a distant station such as the one connected to the line L, operates in the following manner: The operator distant station will apply alternatin nailing current to the line L This u ing signaling current will be trans ad over circuit 8 and will energize the alter nating current relay 15, causing it to pull up its armature and break the normally closed circuit. through the relay 16., it] lch is a slow'operating relay. This will cause the relay 1G to release and close the following circuit: from ground, contact of relay 1%, conductor 17, winding of relay 1,8, conductor 3 19, winding of relay 20, conductor 2-1., conductor 22, contact and armature ct relay 28 to battery 23, and ground. This will. up erate relays 18 and 20. llheioperation of relay 20 will cause signaling current to be as. applied to the circuit 9 and thence out over the line L to signal the operator at a distant station connected thereto. The operation of relay 18 will close the following eirscuit: from ground, armature and contact at of relay- 18, conductor 24, armature and coin tact of relay 28, winding of relay 25, to battery and ground. This will operate relay 25, which will pull up its armature and prepare-the following circuit: from ground and battery 23, right-hand winding oi. relay 28, conductors 26 and 2?, to the left-hand contact of relay 18. ll hon the operator at, the station-connected to line L, ceases to ply alternating signaling current the; I the relay 15 is released, and the relay ill .vi operateto open the previously traced cir cuit for relays 18 and 20, thereby de-energizing these relays. The deencrgization of relay 20 will disconnect signalingcurrent from the line L When relay i8 is new (lo-energized, ground will be applied to the previously traced circuit prepared by the aforementioned operation of relay 25. This will cause relay 28 to operate Relay will.

now become locked up over its left-hand centaet and armature and over the right-hand contact and armatureot relay 29 to ground, Itelay 28 mil have time to become looked ure and COJiSlCl; of relay :28, to ground. The relay 2!), however,

per-ale at lhis time .ue prefiaced circuit llierethrough over contact and arn'iature of brillen iii; said armature 2y the Of ifl'llllill] of relay 2%.

i- -v ihe seci'iud amlicalion of al lei." sting signaling rurreut lo lnc line L,

Will not cause signalingcurreut to be applied to the line L, and to the operator at a dis'lani station. llelay if; will now open ale and close the following circuil: from ground, arii'iature and right-hand couiact of relay l5. conduclor El; 11.. lo conlact of relay 'COIllllKllOl 3L, winding of relayflf), lo bailery and ground. [llus will cause relav to operate. The ground for die aforementioned locking circuit for the relay 28 will now be transferred without interruption from thi rigihhand Contact of relay 25 to the left-hand Contact of said relay. and accordingly the relay 28 will remain in energized condition at this time.

When the operator now ceases to apply alternating signaling current to the line L lhc relay will release, the relay 16 will 5'" operate, and the circuiiz for relay 18 will be broken, causing); said relay co become deemergized agrain. "This will remove the ground from lhe left-hand contacto'l relay and thus open the locking circuit lor relay 28. The relay 229 is a slow-rel relay, and accordingly the relay. 28 Will oecoine deenergized before the relay 29 The release of 28 will open rho previously traced filament circuit 34 and rende the repeater tubes ino 'ieralive.

Bridged across the input circuit 9 is an alternating currenb responsive relay 3]. similar in function lo ihe relay 15. This relay conlrols a relay 3-0, which is a slow operaling: relay and is similar in function lo the relay 1(3. The operalion, when roul'rol is exercised orer the repeater apparatus from a station connected with the line L is substantially the same as that already described, and no further description thereof will begiven.

lVhile the arrangements of the invention have been illustrated. as applied to a. two Way, live-element repeater station, they might equally Well be applied to other types of repeater stations, such as the well known fOllI?--\Vll'(3 type. Furthermore, any desirable frequency alternating signaling" currentn'iay be utilized.

Whilelhis invention has been disclosed as embodied in a particular form and arrangement parts, it is to be understood llhat it is capable of embodiment in other and Widely varied forms Without departing from the spirit and scope of the appended claims.

ll hai'. claimed is:

1. A transmission line coniprising two line sections interconnected by repeater appa arms, a circuit associated with one of said line sections and controlled by signaling current coinio'g in over said liuc section, a relay in said circuit, means controlled thereby for applying, signaling current to rhc other of said line scrlions. a second relay in said circuit, means controlled by the initial operaiion and release of said second relay for rendering said repeater apparatus operative and for short circuiting said first relay, and means controlled by a second operation and release of said second relay for restoring said anangenients to normal.

2, a. transmission line comprising two line sections interconnected by repeater apparatus, a control circuit including t m reays associated with one of said line sections, said control circuit being so arranged that the initial applicaliou of signaling current coming in over said line section will cause both of said. relays to respond, means conlrwllcd by one of said relays for applying signaling current. to the other line see: lion, and means controlled by the second relay for controlling said repeater apparatus and for preventing said first relay from responding lo a successive application of signaling current coming in over said firstline section.

in testimony u'liereol, l have signed my name to this specification l'his l-llli day of May, i925.

JOHN F. 'rcuiu'icii. 

